Bela Bartok's Music for Strings, Percussion and Celesta
, specifically Andante tranquillo
, though parts of Allegro molto
might also qualify.
Samual Barbar's Adagio for Strings
, Krzystof Penderecki's Threnody For The Victims Of Hiroshima For 52 Stringed Instruments
and De Natura Sonoris II For Orchestra
(which sound very much like the music from Altered States
by John Corigliano), Space Requiem
by Stomu Yamash'ta, and Title music for the movie The Bounty
by Vangelis Papathanassiou are honorable mentions.